Marilyn Monroe's 'Happy Birthday, Mr. President' gown expected to fetch $3 million at auction

The dress became a piece of American history when Marilyn Monroe wore it in her unforgettable performance of "Happy Birthday, Mr. President," and more than 50 years later, it will be sold to the highest bidder.

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A collection of the late Marilyn Monroe's belongings will be placed on the auction block later this year, but the iconic dress, emblazoned with more than 2,500 crystals, is expected to be the highlight.

Officials even estimate the sheer dress will fetch no less than $3 million.

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Marilyn Monroe's most iconic looks throughout the years
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Marilyn Monroe's most iconic looks throughout the years
NEW YORK, UNITED STATES - MAY 1962: Actress Marilyn Monroe singing Happy Birthday at the Democratic rally for President John F. Kennedy's birthday. (Photo by Yale Joel/Life Magazine/The LIFE Picture Collection/Getty Images)
Marilyn Monroe's 'Happy Birthday Mr. President' Dress Is Displayed At A Christie's Auction August 13, 1999 In Beverly Hills, Ca. (Photo By Getty Images)
American film star Marilyn Monroe (1926 - 1962) shares a joke with Jack Benny, comedian of radio, television and occasional films. Original Publication: People Disc - HW0707 (Photo by Keystone/Getty Images)
American actress Marilyn Monroe (1926 - 1962) stands in a staircase alongside a wall with a floral-motif pattern, late 1950s. She wears a black cocktail dress and dangling earrings. (Photo by Hulton Archive/Getty Images)
Marilyn Monroe, David Wayne, on-set of the Film, "How to Marry a Millionaire", 1953. (Photo via Alamy)
SOME LIKE IT HOT(1959) MARILYN MONROE, TONY CURTIS SLH 047P MOVIESTORE COLLECTIO LTD. (Photo via Alamy)
Marilyn Monroe, on-set of the Film, "There's No Business Like Show Business", 1954, TM and Copyright (c) 20th Century-Fox Film Corp. All Rights Reserved. (Photo via Alamy)
American actress Marilyn Monroe (L) with her husband baseball legend Joe DiMaggio. (Photo via AFP/Getty Images)

Marilyn Monroe with Joe di Maggio, 1953.

(Photo via Alamy)

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The current owner is reportedly a private investor who purchased the gown in a 1999 auction for nearly $1.3 million.

Monroe donned the sheer dress on stage at Madison Square Garden as she serenaded President John F. Kennedy during a sultry performance in celebration of his 45th birthday.

The intimate performance soon led to speculation of an affair between Monroe and the president.

Read: Marilyn Monroe Lived in Fear of Getting Her Mother's Mental Illness

"Jean Louis created this amazing gown which gave the illusion that Marilyn was in fact wearing nothing at all, except it was bedazzled in over 2,500 crystals," said Martin Nolan, executive director of Julien's Auctions. "The crystals had to be strategically placed on the dress to make sure that there was no fashion faux pas."

Monroe died just three months after the unforgettable performance.

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PHOTOS: A look back at Marilyn Monroe

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New Marilyn Monroe photos
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New Marilyn Monroe photos
GEORGE BARRIS (American, b. 1928) Orange Bikini, 1962
GEORGE BARRIS (American, b. 1928) Green Towel, 1962
BERT STERN (American, 1929-2013) Marilyn Teasing, from The Last Sitting, 1962
BERT STERN (American, 1929-2013) Marilyn Monroe, Here's to You, (from the Last Sitting), 1962
GEORGE BARRIS (American, b. 1928) Laying in the Sand, The Last Shoot, 1962
BERT STERN (American, 1929-2013) Marilyn Monroe, Nude Clutching Scarf, 1962
BERT STERN (American, 1929-2013) Marilyn Monroe, Sequined Gloves, 1962
BERT STERN (American, 1929-2013) Marilyn Monroe, Sleeping, 1962
BERT STERN (American, 1929-2013) Marilyn Monroe, Feeling Good (from the Last Sitting), 1962
GEORGE BARRIS (American, b. 1928) Marilyn Monroe, Flirting, 1962
GEORGE BARRIS (American, b. 1928) Marilyn Monroe, Kiss, 1962
GEORGE BARRIS (American, b. 1928) Marilyn Monroe, Wondering, 1962
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